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Vaccines are the most significant global health promoters with ar reaching benefits. Vaccines prevent diseases in individuals and also prevent their spread. They had already been used in the eradication of most deadly and disfiguring disease like small pox. It also showed good results in bringing down the cases of polio and death caused by Hepatitis B, Tuberculosis, Meningitis, Measles, Tetanus and Diphtheria.
Vaccines assist the body’s defence system. They enable the defence mechanisim of the body to create an immune response memory. Immune response and memory are so very important that the defence circle produced by vaccines can react and fight against the infection when it actually arises. In the making of vaccine a dead or harmless or less severe version of the infection is used . A vaccine given thus can create body’s ability to fight against disease. So vaccines are used as a preventive measure to build an effective defence mechanism.

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